CVE-2026-69793 Windows TCP/IP Security Feature Bypass Vulnerability

Api.Msrc.Microsoft • September 8, 2026

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Released: Sep 8, 2026

Please see Common Vulnerability Scoring System for more information on the definition of these metrics.

Improper validation of consistency within input in Windows TCP/IP allows an unauthorized attacker to bypass a security feature over a network.

The following table provides an exploitability assessment for this vulnerability at the time of original publication.

What kind of security feature could be bypassed by successfully exploiting this vulnerability?

Successful exploitation could bypass network access controls that restrict which remote IPv6 traffic an application accepts. This could allow traffic from a source that should have been blocked to reach the affected application.

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle .

Information published.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple CVEs Disclosed on September 8, 2026, Affecting Microsoft Products On September 8, 2026, multiple CVEs were disclosed affecting various Microsoft products, including SharePoint and Office. Key vulnerabilities include improper access controls, buffer overflows, and command injections, which could allow unauthorized code execution and information disclosure. CVE-2026-85880, noted for active exploitation, was added to CISA's KEV list on the same day. Other vulnerabilities, such as CVE-2026-69428 and CVE-2026-69621, also pose significant risks due to their potential for exploitation. Organizations using affected versions of Microsoft products are urged to apply patches immediately to mitigate risks. The vulnerabilities impact a range of systems, including SharePoint Server and Microsoft Office, and could lead to severe consequences if exploited. 927 sources 74

Extracted Entities

CVE-2026-69793 Windows TCP/IP Security Feature Bypass Vulnerability

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Extracted Entities

CVEs (1)

CWE Weaknesses (1)

Platforms (1)

Vulnerabilities (1)